Frost dates / Utah / American Fork

Frost dates in American Fork, UT

The station on this page is PLEASANT GROVE, UT US (USC00426919), 3.3 miles from the city point. Population in the Census 2024 estimate is 41,298.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 84042 (4.5 miles from the city point used on this page).

Median last 32°F is April 17. Median first 32°F is October 25. The 50% growing-season length is 188 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	March 30	Earlier date. A last 32°F on or after this day is common.
50%	April 17	Median.
10%	May 7	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	October 10	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 25	Median.
90%	November 8	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	213
50%	188
90%	162

28°F threshold

	10%	50%	90%
Last, on or after	April 17	March 30	March 8
First, on or before	October 21	November 5	November 19
Season at least	246 days	220 days	193 days

36°F threshold

	10%	50%	90%
Last, on or after	May 23	May 3	April 19
First, on or before	September 29	October 13	October 27
Season at least	182 days	161 days	135 days

Station PLEASANT GROVE, UT US (USC00426919). Completeness flag S, 26 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 1430.1 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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American Fork, UT

Zone 7aAverage annual extreme minimum 0°F to 5°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Utah. Nearest qualified station: PLEASANT GROVE, UT US (USC00426919), 3.3 miles. Median last 32°F April 17. Median first 32°F October 25. The 50% growing-season length is 188 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 7	April 17	March 30
First 32°F on or before	October 10	October 25	November 8

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Utah are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

Date checks use your device’s calendar and appear after the page loads.